539940 (2017 HW1)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4585305393 ± 1.85e-08
Semi-major axis (a)2.1379494101 AU ± 2.27e-08
Inclination (i)33.93429844° ± 5.61e-06
Long. of Asc. Node (Ω)41.31082257° ± 2.15e-06
Arg. of Perihelion (ω)168.80631156° ± 8.78e-06
Mean Anomaly (M)282.85413711° ± 1.06e-05
Mean Motion (n)0.3152943146°/day ± 5.02e-09
Perihelion dist (q)1.15763431 AU ± 4.14e-08
Aphelion dist (Q)3.11826451 AU ± 5.16e-08
Orbital Period3.12605156 yr ± 4.97e-08
Physical Parameters
H (abs. magnitude)18.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.518″
Uncertainty0
Orbit TypeAmor
MOID0.155744 AU
Observations Used1400
Oppositions9
Arc Total2012-2025
First Observation Used2012-10-22
Last Observation Used2025-12-13
Observations (2295)
Date Type RA Dec Mag Band Observatory
2018-09-17 10:04:06 C 03 01 48.42 +07 22 33.1 o 291
2018-09-18 08:35:12 C 03 01 16.53 +07 23 06.7 u H21
2018-09-18 08:46:00 C 03 01 16.26 +07 23 06.9 u H21
2018-09-18 08:57:05 C 03 01 15.98 +07 23 07.2 u H21
2018-09-19 08:44:02 C 03 00 40.76 +07 23 40.5 u H21
2018-09-19 08:48:27 C 03 00 40.64 +07 23 40.1 u H21
2018-09-19 09:02:53 C 03 00 40.28 +07 23 41.2 u H21
2018-09-19 09:07:17 C 03 00 40.16 +07 23 40.9 u H21
2018-10-01 08:42:41 C 02 51 33.34 +07 27 20.8 u H21
2018-10-01 08:54:04 C 02 51 32.91 +07 27 21.0 u H21
2018-10-01 09:10:08 C 02 51 32.29 +07 27 20.8 u H21
2018-11-11 04:59:58 C 02 02 24.11 +07 31 08.9 u H21
2018-11-11 05:15:29 C 02 02 23.30 +07 31 09.5 u H21
2018-11-11 05:36:25 C 02 02 22.18 +07 31 10.3 u H21
2020-01-05 10:00:37 C 13 38 36.44 +54 58 36.8 V 703
2020-01-05 10:08:29 C 13 38 37.59 +54 58 38.4 V 703
2020-01-05 10:16:21 C 13 38 38.94 +54 58 39.3 V 703
2020-01-05 10:24:14 C 13 38 40.01 +54 58 41.5 V 703
2020-01-14 10:37:03 C 14 10 59.09 +55 24 32.3 V G96
2020-01-14 10:44:29 C 14 11 00.14 +55 24 33.0 V G96
2020-01-14 10:51:56 C 14 11 01.20 +55 24 33.8 V G96
2020-01-14 10:59:23 C 14 11 02.38 +55 24 35.0 V G96
2020-01-16 11:20:03 C 14 18 00.51 +55 29 17.9 U I41
2020-01-16 11:43:41 C 14 18 03.84 +55 29 20.6 U I41
2020-01-16 12:18:38 C 14 18 08.73 +55 29 24.5 U I41
2020-01-16 13:19:57 C 14 18 17.35 +55 29 30.8 U I41
2020-01-25 10:29:49 C 14 47 29.91 +55 46 27.9 V 703
2020-01-25 10:37:41 C 14 47 30.87 +55 46 27.9 V 703
2020-01-25 10:45:31 C 14 47 31.66 +55 46 28.3 V 703
2020-01-25 10:53:22 C 14 47 32.77 +55 46 29.9 V 703
2020-01-28 10:26:29 C 14 56 41.99 +55 50 56.1 V 703
2020-01-28 10:44:00 C 14 56 44.27 +55 50 56.8 U I41
2020-01-28 10:50:00 C 14 56 44.96 +55 50 58.2 V 703
2020-01-28 11:54:50 C 14 56 52.94 +55 51 02.5 U I41
2020-01-28 12:25:56 C 14 56 56.63 +55 51 05.0 U I41
2020-01-28 13:16:32 C 14 57 02.79 +55 51 08.3 U I41
2020-01-28 13:40:29 C 14 57 05.69 +55 51 09.8 U I41
2020-02-01 11:22:33 C 15 08 29.80 +55 56 06.2 U I41
2020-02-01 11:42:48 C 15 08 32.11 +55 56 07.5 U I41
2020-02-01 12:09:13 C 15 08 35.13 +55 56 09.1 U I41
2020-02-01 13:27:15 C 15 08 44.08 +55 56 13.7 U I41
2020-02-01 13:44:35 C 15 08 46.05 +55 56 14.7 U I41
2020-02-03 09:54:38 C 15 13 54.13 +55 58 13.0 V 703
2020-02-03 10:01:48 C 15 13 54.93 +55 58 13.3 V 703
2020-02-03 10:08:58 C 15 13 55.90 +55 58 13.2 V 703
2020-02-03 10:16:09 C 15 13 56.68 +55 58 14.3 V 703
2020-02-05 08:29:29 C 15 19 08.24 +56 00 04.0 U I41
2020-02-05 08:49:41 C 15 19 10.47 +56 00 05.8 U I41
2020-02-05 10:34:46 C 15 19 21.72 +56 00 13.6 V G96
2020-02-05 10:36:10 C 15 19 21.87 +56 00 13.7 V G96